'89 Trooper stalls

1989 ISUZU
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REYBARRY
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My small engine '89 Trooper with 157k is used for errands around town. It was tuned a few months ago and runs beautifully. Starts right up every time. BUT two times this month it stopped running while waiting at a stop light, and refused to re-start for nearly an hour. This is all-or-nothing. It's either running perfectly or not at all, then fixes itself. When it won't start it either doesn't fire at all or doesn't get fuel. [I haven't yet been able to check which.] What parts, sensors, etc. are likely to become suddenly inopperative and a few minutes later suddenly operative again?
Dec 31, 2006 at 12:06 PM
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SERVICE WRITER
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What parts, sensors, etc. are likely to become suddenly inopperative and a few minutes later suddenly operative again?

Many.

Try this when the problem happens to eliminate the fuel system: Turn the key to the on position and listen for a hum from the pump. If you can't hear it, access the throttle body and spray starting fluid into it and try cranking it, does it start?
Jan 1, 2007 at 8:02 AM
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REYBARRY
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[quote:3c3c012439="Service Writer"]Try this when the problem happens to eliminate the fuel system: Turn the key to the on position and listen for a hum from the pump. If you can't hear it, access the throttle body and spray starting fluid into it and try cranking it, does it start?[/quote:3c3c012439]

Thanks! I'll carry some fluid from now on and try it on the next failure.
Jan 1, 2007 at 7:35 PM